pam_lastlog.c revision 202566 
1/*-
2 * Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 * Copyright (c) 2001 Mark R V Murray
5 * All rights reserved.
6 * Copyright (c) 2001 Networks Associates Technology, Inc.
7 * All rights reserved.
8 * Copyright (c) 2004 Joe R. Doupnik
9 * All rights reserved.
10 *
11 * Portions of this software were developed for the FreeBSD Project by
12 * ThinkSec AS and NAI Labs, the Security Research Division of Network
13 * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
14 * ("CBOSS"), as part of the DARPA CHATS research program.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
18 * are met:
19 * 1. Redistributions of source code must retain the above copyright
20 *    notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 *    notice, this list of conditions and the following disclaimer in the
23 *    documentation and/or other materials provided with the distribution.
24 * 3. The name of the author may not be used to endorse or promote
25 *    products derived from this software without specific prior written
26 *    permission.
27 * 4. Neither the name of the University nor the names of its contributors
28 *    may be used to endorse or promote products derived from this software
29 *    without specific prior written permission.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
32 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
34 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
35 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
39 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
40 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
41 * SUCH DAMAGE.
42 */
43
44#include <sys/cdefs.h>
45__FBSDID("$FreeBSD: head/lib/libpam/modules/pam_lastlog/pam_lastlog.c 202566 2010-01-18 11:29:51Z ed $");
46
47#define _BSD_SOURCE
48
49#include <sys/time.h>
50#include <pwd.h>
51#include <stdlib.h>
52#include <string.h>
53#include <time.h>
54#include <unistd.h>
55#include <utmpx.h>
56
57#define PAM_SM_SESSION
58
59#include <security/pam_appl.h>
60#include <security/pam_modules.h>
61#include <security/pam_mod_misc.h>
62
63#define	PAM_UTMPX_ID	"utmpx_id"
64
65PAM_EXTERN int
66pam_sm_open_session(pam_handle_t *pamh, int flags,
67    int argc __unused, const char *argv[] __unused)
68{
69	struct passwd *pwd;
70	struct utmpx *utx, utl;
71	time_t t;
72	const char *user;
73	const void *rhost, *tty;
74	char *id;
75	int pam_err;
76
77	pam_err = pam_get_user(pamh, &user, NULL);
78	if (pam_err != PAM_SUCCESS)
79		return (pam_err);
80	if (user == NULL || (pwd = getpwnam(user)) == NULL)
81		return (PAM_SERVICE_ERR);
82	PAM_LOG("Got user: %s", user);
83
84	pam_err = pam_get_item(pamh, PAM_RHOST, &rhost);
85	if (pam_err != PAM_SUCCESS) {
86		PAM_LOG("No PAM_RHOST");
87		goto err;
88	}
89	pam_err = pam_get_item(pamh, PAM_TTY, &tty);
90	if (pam_err != PAM_SUCCESS) {
91		PAM_LOG("No PAM_TTY");
92		goto err;
93	}
94	if (tty == NULL) {
95		PAM_LOG("No PAM_TTY");
96		pam_err = PAM_SERVICE_ERR;
97		goto err;
98	}
99
100	if ((flags & PAM_SILENT) == 0) {
101		if (setutxdb(UTXDB_LASTLOGIN, NULL) != 0) {
102			PAM_LOG("Failed to open lastlogin database");
103		} else {
104			utx = getutxuser(user);
105			if (utx != NULL && utx->ut_type == USER_PROCESS) {
106				t = utx->ut_tv.tv_sec;
107				if (*utx->ut_host != '\0')
108					pam_info(pamh, "Last login: %.*s from %s",
109					    24 - 5, ctime(&t), utx->ut_host);
110				else
111					pam_info(pamh, "Last login: %.*s on %s",
112					    24 - 5, ctime(&t), utx->ut_line);
113			}
114			endutxent();
115		}
116	}
117
118	id = malloc(sizeof utl.ut_id);
119	if (id == NULL) {
120		pam_err = PAM_SERVICE_ERR;
121		goto err;
122	}
123	arc4random_buf(id, sizeof utl.ut_id);
124
125	pam_err = pam_set_data(pamh, PAM_UTMPX_ID, id, openpam_free_data);
126	if (pam_err != PAM_SUCCESS) {
127		free(id);
128		goto err;
129	}
130
131	memset(&utl, 0, sizeof utl);
132	utl.ut_type = USER_PROCESS;
133	memcpy(utl.ut_id, id, sizeof utl.ut_id);
134	strncpy(utl.ut_user, user, sizeof utl.ut_user);
135	strncpy(utl.ut_line, tty, sizeof utl.ut_line);
136	if (rhost != NULL)
137		strncpy(utl.ut_host, rhost, sizeof utl.ut_host);
138	utl.ut_pid = getpid();
139	gettimeofday(&utl.ut_tv, NULL);
140	pututxline(&utl);
141
142	return (PAM_SUCCESS);
143
144err:
145	if (openpam_get_option(pamh, "no_fail"))
146		return (PAM_SUCCESS);
147	return (pam_err);
148}
149
150PAM_EXTERN int
151pam_sm_close_session(pam_handle_t *pamh, int flags __unused,
152    int argc __unused, const char *argv[] __unused)
153{
154	struct utmpx utl;
155	const void *id;
156	int pam_err;
157
158	pam_err = pam_get_data(pamh, PAM_UTMPX_ID, (const void **)&id);
159	if (pam_err != PAM_SUCCESS)
160		goto err;
161
162	memset(&utl, 0, sizeof utl);
163	utl.ut_type = DEAD_PROCESS;
164	memcpy(utl.ut_id, id, sizeof utl.ut_id);
165	utl.ut_pid = getpid();
166	gettimeofday(&utl.ut_tv, NULL);
167	pututxline(&utl);
168
169	return (PAM_SUCCESS);
170
171 err:
172	if (openpam_get_option(pamh, "no_fail"))
173		return (PAM_SUCCESS);
174	return (pam_err);
175}
176
177PAM_MODULE_ENTRY("pam_lastlog");
178